Device to prevent retrograde movement



March 4, 1930. w, LAVERY l',749,638

DEVICE To PREVENT RETROGRADE MOVEMENT Filid Dec. 20, 1928 2 Sheets-Sheet `l vwentoz M MM LA l/f/Wf March 4, 1930; w. LAVERY DEVICE TO PREVENT RETROGRADE MOVEMENT Filtd Dec. 20, 1928 2 Sheets-Sheet 2 /3 if? W Patented Mar. 4, 1930 PATENT OFFICE WILLIAM LAVERY, F BLOOMFIELD, NEW JERSEY DEVICE TO IERFElbT'l RETRGGRADE MOVEMENT Application filed December 20, 1928. Serial No. 327,317.

positive locking device for the propeller shaft 0 While permitting the use of the hand andk ofthe yvehicle which is entirely'independent of the usual service or emergency brakes thereof and which is operable to secure vthe vehicle Vagainst rearward drifting movement feet of the driver to operate the vehicle in a forward direction. f

A furtherimportant object of the invention is to lprovide an apparatus of this character which may be leasily and quickly installed in operative position upon the vehicle without necessitating any material changes or alterations in the construction thereof and which Vembodiesa pawl and ratchet construction in which the pawl is adjustably secured Vso to the frame of the vehicle, in both a horizontal and vertical position whereby to adapt the devicefor use upon practically all makes o-f motor driven vehicles.

` A still further important object ofthe invention is to provide an apparatus of this character which may be embodied as a part 'of the brake drum construction for the propeller shaft ofthe vehicle, when the sameis k4o equipped with a brake mechanism of this character.

Other objects and advantages reside in the special construction,` combination and arrangement of the various elements forming the invention as more fully hereinafter de# scribed and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like n parts throughout, and in which z.

Figure l is a fragmentary longitudinal sectional view through a motor driven vehicle illustrating one form of the invention in operative position with respect thereto,

Figure 2 is a transverse sectional view therethrough with the pawl supporting bracket shown in section for illustrating the vertical and horizontal adjusting means therefor, y f

Figure '8 is a sectional view taken substantially along a line 3-3 of Figure 2,

Figure 4 is a fragmentary detail7 with parts shown in section of the ball bearing mounting for the ratchet engaging pin of the pawl,

` Figure 5 is a detail, shown in elevation, of the frame attaching bracket for the pawl, and

Figure 6 is a fragmentary transverse sectional view illustrating the manner of operatively mounting the device in operative association with a propeller shaft brake drum.

Referring now to the drawings in detail, wherein for the purpose of illustration I have disclosed a preferred embodiment of the invention, the numeral 5 yillustrates generally the body o-f a motor driven vehicle having the usual floor 6 supported upon the usual vehicle frame member 7. i

The vehicle is provided with the usual propeller shaft 8 extending through `the transmission housing 9 for driving the vehicle in a manner well known in the art. In the form of the invention illustrated in Figures 1 to 3 inclusive, the propeller shaft is provided with a ratchet wheel 10, suitably keyed thereto for rotation with said shaft and with which ratchet wheel is operatively associated a pawlindic'ated generally at 11 adapted to engage the teeth of the ratchet wheel for securing the same against movement iny one direction, namely in a reverse direction when the mechanism of the vehicle is arranged for driving the same forwardly.

' The pawl is constructed of a U-shaped lmember l2 extended upwardly and pivotally supported at its 'lower end upon a pin 13 carried by a' horizontally disposed bracket section 14. One end of the bracket section 14 is secured in a stationary position by a plate l5 attached to the under side of the transmission housing' 9. A ratchet engaging pin 16 extends transversely between the parallel arms of the U-shapedmember 12 and has its opposite ends journaled for rotation in ball bearing assemblies 17 carried bythe respective arms of said U-shaped member'. i

The horizontal bracket section 14 is provided With a pair of spaced'parallel lugs betWeeneWhich-a block 19 is positioned and having trunnions 2O extending .from op-v posite sides thereof forming a pivot-al mount-V` by to attach an intermediate bracket member' 37 to the-horizontal and vertical bracket ing for said blockv between said lugs.-` yAbolt 21 has one end slidably'insertedin saidblock with its opposite end secured in. a block 22 also having trunnions23 extending from opposite sides thereof foi? pivotally supporting said block between the parallel arms of the JU-sh'aped. member .12.

Airexpansion spring 24 is mounted onithe bolt andV interposed.betvveenthel blocks `19 'and v:22 vwhereby to,V normally urge the 1SU-shaped1inember 12 in a direction toward Vthe'.ratchetlvfheel for the engagement of the pinf16 thereof. z Locknutsn25are threaded at each end of the bolt for adj usting the ends lthereof Withrespectto kthe blocks 19 and 22.

One end ofitheU-shape'd member'12'isprovided. Withk an. extension 26 adapted for ,ein .gagement at-'i-ts sides opposite'from the bolt 21 by a pin 27 projecting laterally Vfrom the Alovver end .of` alever 28.` The lever. isfpivotal- 1 -ly.mountedintermediate its ends upon azsuitablefpinf and support 29 land=30 respectively secured to lthe under sideV of .theffloor 6 and vextends upwardly'through a slotted opening 31 formed in the floor.

*.'The flever. is: pivoted for movement transversely With .respect yto =the vehicle and hasa Yquad-rant 32uassociated therewith by. means ofcvvhich t'helever kvmay be secured infits respective .positions by means of aLconve-ntional .latchmemben It Will .be:appare nt from lan inspection of Figure 2 vof the drawings thatthrough the operation ofthe lever; the -pavvl l1 may bemovedout of 'engagement with respect to rtheratchetwheel 10 Whereas Vthe spring 241carried von the bolt 21 yieldably urges the'pavvl into engaged-position.

The lever-ismounted'in aconven-ient position'for operationby vthedrlver of the'vehicle andmay be Umoved in adirection -for releasing the paWl-'Whereby to vpermit the paivl to be moved into engagement Withfthe ratchet Wheel Vshould .the car beccinestalled Whileproceeding upgrade andthe operator .'desires tosecure lthe car against retrograde movement Lvvit'hout employing the use ofthe usual service or emergency brake mechanism.

. "'Bysecuring the vehicle against movement inthe manner, indicated the driver may employ both handsvandffeet lfor again starting the :engine of thecargand'driving the same f Yforwardly Without the necessity,l of releasing lthe auxiliary .brake lever 28, it being apparent Yth'atithe ratchet- Wheel vvill-V freely ride over A vertically disposed bracket member 34" is bolted to the frame Tof the vehicle and de provided With slotted: f openings 352 `through which bolts 36 are adj ustably inserted Wheremembers. o By'reasonof this construction it will be apparent that'the pawl and associated partsmaybeadjusted both vertically and,V horizontally for proper positioning with respectito the ratchet WheelV 10.l l

In :the form of the, invention illustrated in Figure 6 of the drawingft-he propeller Ashaft -8 of thevehicle.isushown.providedw'witha ybrake drum .38v .Withf-vvhichn a .brake band- 39 is operatively. associated. -As,. a convenient method of mounting theY sgubj ect matter -of the present'invention in'relationto said brake mechanism,the ratchet'vvheel 10- -is shown se- Gured toene (face fofgthegbrake'; drumwviththe e.

shaft axially ldisposedvvvith respect thereto, the-supporting bracketrfor. thepavvl ,being attached to the transmission housing., in .fthe manneras heretofore explained.

l It is obviousftliat my. invention.- i s suscepti- Y, ble to.r vvariouschanges and modiica'tions `:in lconstruction Without departing from the spirit ofthe invention or thescope ofthe apvpendedclaim,2 andiA Itaccordinglygclaim .all

such forms VV'of thejfdevice to.-Wl1ichllf am entitled. f A

Having thus described my inventi'onfivhat `I claim as new is:

. A. device, of the.. .@iass desdites.. Comprisings in combination, a vehicle. propeller shaft, L; f. aratchetvvheelattached thereto, a. .pavvlz .for

said ratchet '.w'vheel7` spring .means normally urgingthesame intoengaged. position, a lever its CII

operable for. lmov-ing the. paWl. outv ofengagey' ment andan-adjustable. support'for said pavvl,4 said support. f comprising av plurality of rbracket members including. a horizontal Y member, a verticalmember, anintermediate member, and means ,for a,d]ustably,securing said/intermediate ,member with: respect to eachE ofsaid first named members.

In testimony whereof Iv yaffix my signature.

WILLIAM Lavniiv.v n

Jt'he'pin 16 offthe'pawl duringthe forward y movement of the car.

.ii s 

